car radio system ccr520s

8/12/2019 Car Radio System CCR520S

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APPLICATION NOTE

Outline Specification ofHigh-End RDS/EON Car Radio

System CCR520S (V2.6)

AN96022


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Philips Semiconductors

Outline Specification of High-End RDS/EONCar Radio System CCR520S (V2.6)

Application Note96022

Philips Electronics N.V. 1997

All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copy-right owner.

The information presented in this document does not form part of any quotation or contract, is believed to beaccurate and reliable and may be changed without notice. No liability will be accepted by the publisher for anyconsequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrialor intellectual property rights.

Purchase of Philips I2C components conveysa license under the I 2C patent to use the com-p on en ts in t he I2C system, provided thesystem conforms to the I2C specificationsdefined by Philips.

Abstract

CCR520 is a computer controlled high-end AM/FM car radio system with RDS/RBDS decoding. It is based on a

single 8051 family microcontroller (P83CE528) and various I2C-bus controlled peripherals.

The system contains functions such as PLL tuning, IF control, stereo decoding, RDS/RBDS+EON decoding, IAC,

sound switching, sound fader control, LCD display, cassette interface, external audio input jack, clock function,

infra red remote control and a detachable front.

Radio control and RDS/RBDS+EON processing are combined in a single microcontroller.

"The purchase of Philips complete set of Integrated Circuits as specified in this Outline Specification for

manufacture of a radio system conforming the relevant specification as herein given, secures immunity from suit

on unauthorized use of those Philips patent rights, which specifically relate to automatic broadcast station

storage (AST) and/or radio data system (RDS) features."

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Outline Specification of

APPLICATION NOTE

High-End RDS/EON Car RadioSystem CCR520S (V2.6)

AN96022

Author(s):

A. DemmersM. Verheijden

Product Concept & Application Laboratory Eindhoven,

The Netherlands.

Keywords

Car RadioRadio Data System

Radio Broadcast Data SystemEON

CCR520SP83CE528

Remote control

Clock function

Number of pages: 30

Date: 1996-03-15

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Summary

CCR520 is a computer controlled high-end AM/FM car radio system with RDS/RBDS decoding. It is based on a

single 8051 family microcontroller (P83CE528) and various I2C-bus controlled peripherals.

The system contains functions such as PLL tuning, IF control, stereo decoding, RDS/RBDS+EON decoding, IAC,

sound switching, sound fader control, LCD display, cassette interface, external audio input jack, clock function,

infra red remote control and a detachable front.

Radio control and RDS/RBDS+EON processing are combined in a single microcontroller.

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CONTENTS

1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2 BASIC HARDWARE CONFIGURATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3 SHORT SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 TARGET CHARACTERISTICS OF THE RADIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5 MICROCONTROLLER AND PIN ASSIGNMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6 KEYBOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

7 OPTION DIODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

8 LDC DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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Document history

Modifications with respect to the application note"Outline Specification of Computer Controlled Car RadioSystem CCR520S V2.5", report number AN96007 :

1. Added infra red RC5 remote control.

Modifications with respect to the applicationnote "Outline Specification of Computer Controlled Car RadioSystem CCR520S V2.0", report number AN95033 :

1. NVM Initialization added.2. Clock with synchronisation to RDS added

3. Sleep timer changed from 30 minutes to 1 hour.

Modifications with respect to the applicationnote "Outline Specification of Computer Controlled Car RadioSystem CCR520S V1.5", report number ERA/AN93008 :

1. USA option added for RBDS and USA band limits / tuning grid.

2. Allow AF-switching to Supra-regional transmitters for RDS.

3. PTY functionality.

4. During AST running frequency is not displayed any more.

5. The TA / PTY Alarm volume level is programmable.

6. Improved RDS decoding and AF switching behaviour especially with respect to multipath.

7. Improved EON preset update.

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1 INTRODUCTIONCCR520S is a computer controlled system based on a P83CE528 microcontroller. It controls a high-endAM/FM car radio with RDS (Radio Data System) or RBDS (Radio Broadcast Data System) and EON(Enhanced Other Networks information) and various I2C-bus controlled peripherals.

The main features are:

Radio control and RDS/RBDS decoding in a single microcontroller.

Bands: FM, MW, LW. (Factory options: FM only / LW disable)

Tuning: manual, automatic (search and scan), Automatic Store Tuning (AST), options: tuning grid and

band limits for different parts of the world (Europe/USA option).Presets: 18 FM, 12 MW, 6 LW.

External audio jack for e.g. CD player.

Controls power stabilizer IC.

PLL frequency synthesizer.

Sound control: volume, bass, treble, balance, fader, loudness and mute via I2C-bus or potentiometers.

RDS/RBDS functions:

- PS: Programme Service name display and storage in Non Volatile Memory;

- PTY: Programme TYpe display and searching;

- TP/TA: Traffic Announcements break-in;

- AF/PI: Alternative Frequency follow and storage in Non Volatile Memory;

- EON: Enhanced Other Networks traffic announcements and update of preset AF lists in NVM.- CT: Clock-time information extraction for clock function.

Security code:

- enable/disable by the user;

- preprogrammable in the factory by means of a service mode.

Non Volatile Memory for:

- programme presets;

- RDS/RBDS information;

- System status.

LCD display with 120 or 144 segments.

Keyboard optionally detachable with up to 27 key functions.

Remote controlClock function

NOTE: RBDS is an extension of the European RDS system. Every reference in this document to RDS isalso valid for the RBDS system, unless specified otherwise.

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2 BASIC HARDWARE CONFIGURATION

Thebasic configuration of the computer controlled car radio system CCR520 is given in thefiguresbelow.

IF SYSTEMTEA6100

L

R

AM IF

10.7 MHz

FoscVtun

40 kHzVtunFosc

LCD

DISPLAY

I IC-BUS

VOLTAGESTABILIZER

TDA3602

AM TUNER

TEA6200

FM / AM

CASSETTE

INTERFACE

LCD DRIVERPCF8576 or

2 X PCF8566

R D S

DEM O D.

SAA6579

RDSCLK

RDSDAT

EEPROM

PCF8582

PCF8594

MICROCONTROLLERCCR520S

(P83CE528)

F MFRONT END

TDA1574

IAC &STEREO DEC.

TDA 1591

P L L

SYNTHESIZER

TSA6057

AF CONTROL

TEA6330T

O R

TDA1526

P O W E R

A M P

TDA1552Q

or

TDA1554Q

EXTERNAL

J A C K

DIFFERENTIAL

LINE AMP.

TDA8579 Cassette

audio input

External

audio input

Figure 1 Block diagram of CCR520 with fixed keyboard

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IF SYSTEM

TEA6100

L

R

AM IF

10.7 MHz

F o s cVtun

40 kHzVtunF o s c

LC D

DISPLAY

IIC-BUS

VOLTAGE

STABILIZER

TDA3602

AM TUNER

TEA6200

FM / AM

CASSETTE

INTERFACE

LCD DRIVER

PCF8576 or

2 X PCF8566

R D S

D EMO D .

SAA6579

RDSCLK

RDSDAT

EEPROM

PCF8582

PCF8594

MICROCONTROLLER

CCR520S

(P83CE528)

F M

FRONT END

TDA1574

IAC &

STEREO DEC.

TDA 1591

PL L

SYNTHESIZER

TSA6057

AF CONTROL

TEA6330T

O R

TDA1526

P O W E R

A M P

TDA1552Q

or

TDA1554Q

DETACHABLE

KEYBOARD

SCANNER

PCF8574

IIC-BUS EXTERNAL

JACK

DIFFERENTIAL

LINE AMP.

TDA8579 Cassette

audio input

External

audio input

IR RC5 to

IIC convertor

Figure 2 Block diagram of CCR520 with detachable keyboard

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The CCR520 concept requires the next ICs to be present in the system:TDA1574(T) Performs all the FM front-end functions, except the R.F. pre-amplifier stage.

Incorporates an FM/IF pre-amplifier.

TEA6200 AM tuner, up-conversion system. Does not need an aerial tuned circuit. I.F.frequency 10.7 MHz. No alignments needed.

TEA6100 Integrated FM/IF system including a digital AM/FM tuning interface formicrocomputer controlled radios with an I2C-bus.

TSA6057(T) PLL synthesizer withseparate prescalers for AMand FM and loop filteroutputs.I2C-bus controlled.

TDA1591(T) System combination of adjustment free PLL stereo decoder with de-emphasiscontrol and an Interference Absorption Circuit (IAC) with low component count.Specially designed for car radios.

TEA6330T or I2C-bus (TEA6330) or potentiometer (TDA1526) controlled AF pre-amplifier

TDA1526 for car and home receivers. Includes volume, bass, treble, balance, fader(TEA6330) control and mute (TEA6330).

CCR520S The microcontroller, based on a P83CE528EFB. It is a 8051 derivative with an8-bit CPU, 32 Kbytes ROM, 512 bytes RAM and four 8-bits I/O ports in a 44-pin

QFP package.

TDA3602 Supply voltage stabilizer in SIL package with three output voltages (2 x 5V and8.5V). Two outputs are switchable by external controls.

TDA1552Q Class-B audio power amplifiersin SIL plastic package with4 identical amplifiers.

TDA1554Q The TDA1552Q can deliver 2 x 22 W in BTL configuration, the TDA1554Q candeliver either 4 x 11 W or 2 X 22 W.

SAA6579(T) RDS demodulator with onboard 57 kHz bandpass filter and a digitaldemodulator. Outputs a digital data signal and a clock signal for further

processing.

PCF8566T LCD display drivers that interface to almost any liquid crystal display (LCD)

PCF8576CT having low multiplex rates. They generate the drive signals for any static ormultiplexed LCD with up to four backplanes and up to 24 (PCF8566) or 40(PCF8676) segment lines and can easily be cascaded for larger LCDapplications. I2C-bus controlled.

PCF8582/94C-2P/T 256/512 byte 5V electrically erasable programmable read only memories(EEPROM) that can be 100,000 times re-written.

PCF8574(T) Detachable Keyboard Scanner. I2C-bus controlled.

TDA8579(T) Differential Line Amplifier for external input.

84C21A Programmed with RC5 to I2C convertor software.

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3 SHORT SPECIFICATION

Tuning

Frequency bands

Optionally the following frequency bands are used:

FM: 87.50 - 108.00 MHz (50 / 100 kHz steps) }

MW: 531 - 1629 kHz (1 / 9 kHz steps) } For application in Europe

LW: 144 - 288 kHz (1 kHz steps) }

FM: 87.90 - 107.90 MHz (50 / 100 kHz steps) } For application in USA

AM: 530 - 1710 kHz (1 / 10 kHz steps) }

PLL tuning principle.

Manual tuning up / down.

Initially slow pace / fine grid. After 2.5 sec. fast pace / coarse grid.

Local/DX switch.

The local/DX feature controls the search sensitivity. If the FM tuner has a tuner attenuator, the local/DXswitch controls the attenuator during search. If not, it controls the signal level threshold during search.Default after switching on is always DX mode.

Automatic search tuning up / down.

Sensitivity is controlled by local/DX. If afterone complete band sweep in local mode no station is found,the radio switches automatically to DX. Automatic muting and display of running frequency.

Frequency scan.

Continuous automatic search tuning, pausing for 6 seconds on every station.

AST (Automatic Store Tuning) for FM and MW band.

AST switches to FM-AST or MW-AST band, searches for the 6 strongest transmitters and stores themin the AST programme preset memory. In FM, duplication of PI codes will be avoided.

Programme preset memory.

For each band (FM1, FM2, MW, LW, FM-AST and MW-AST) 6 programme presets and a "manual"frequency are stored. In FM, additional RDS information is stored: PI code (Programme Identification),PS-name (Programme Service), AF list (Alternative Frequencies) and AF follow mode on/off.

Whenever another band is selected, the radio reverts to the last frequency tuned to in the new band.(This can be either a preset frequency or a manually tuned frequency).

Programme preset up / down control.

Programme presets can be recalled/stored by two key control (up and down) or by 6 separate presetkeys.

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AF follow mode.If AF follow mode is on,the set will regularly measurethe signal strength on alternative frequencies andcompare it with the current station. If an alternative frequency offers better quality, the radio will switchover, and update the alternative frequency list. The measuring scheme is designed to cause minimumnoticeable disturbance for the listener. The interval time between two measurements depends on thesignal quality.

Intelligent preset programme recall.

If an FM programme preset with a known PI code is recalled, the primary frequency and all alternativefrequencies stored in NVM are examined. The frequency with the highest signal strength thatbroadcasts the correct PI code will be selected. Only when the programme is not found on one of theAFs, a search is started after 6 seconds for a station with the proper PI code.

TA mode.

In TA mode the radio only searches for traffic stations. These are stations that may transmit (EON)traffic announcements.

The radio will automatically start a search when switching TA mode on and the current station is not atraffic station.

PTY search mode.

In PTY search mode the radio only searches for transmitters that transmit a user-selected PTY code.

Dependent on the factory option USA/Europe the RBDS PTY-table or the RDS PTY-table is used.

Last status memory: frequency, PI code, PS Name, AF lists and AF follow mode on/off status arestoredin memory for each preset in each band. This status is recalled during preset switch, band switch andswitch on.

RDSBit, block and group synchronisation (inclusive RBDS E-block detection).

Data decoding and collection of:

- PI, Programme Identification code;

- AF, Alternative Frequencies;

- TP, Traffic Programme;- TA, Traffic Announcement;

- PS, Programme Service name;

- PTY, Programme TYpe;

- EON, Enhanced Other Networks information;

- CT, Clock-time information.

AF follow mode using PI and AF (see also Tuning).

Display of the Programme Service name in 8 alpha-numeric characters (PS name).

Display of AF, TP, TA, PTY and regional mode status.

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Regional mode on/off switching. When regional mode is on, the radio will, during AF switching, onlyswitch over to stations with exactly the same PI-code or Supra-regional code. When regional mode isoff, the radio will also switch over to stations broadcasting regional variants of the original PI-code. (socalled "generic" or "family" PI-codes). For USA application (RBDS) the regional function will only workfor PI codes above B000hex. PI codes below B000hex dont have regional variants. (AF-switching is onlyallowed to stations with exactly the same PI code).

Break-in of traffic announcements and PTY alarm messages when the radio is muted or in Cassette /External mode.

EONTemporally switch to an other station if EON information indicates a traffic announcement on that otherstation even when the radio is muted or in Cassette / External mode.

Update lists of alternative frequencies of other stations stored in preset memory with informationreceived via EON.

ControlUp to 27 local control keys on either a fixed, a detachable keyboard or a combination.

Detachable front

Optionally, the keyboard and the LCD display unit can be placed on a detachable front, controlled bya 2 n d I2C bus. Only 5 contacts are required to connect the detachable front (6 if it hosts also the powerkey). No extra hardware is required to detect its presence.

Remote control

A remote control unit can be added in case a detachable keyboard is used. Several functions can becontrolled from the remote control. The remote control hardware is connected with the detachablekeyboard I2C bus.

Display

120 Segment LCD or 144 Segment LCD with Umlaut () and Accent () characters, 1:3 multiplexed.

8 Alphanumeric characters + decimal point are used for display of:

- Band and frequency (Example: "FM 103.50")

- Indication "BALANCE", "FADER", "TREBLE", "BASS" and their position (either analog bar or digital)

- The security code being entered

- RDS programme service name (PS) in 8 alphanumeric characters

- RDS programme type (PTY)

- "MUTE", in case the user mutes the radio, cassette or external

- Cassette mode function such as "PLAY ->", "CAS WIND", etc.

- Clock display can be: " 08.12" or " --.--" if not yet synchronised to RDS clock.

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7 Segment display for the current programme preset number.

8 Icons for display of:

- STEREO On when stereo pilot signal is detected, off when forced mono is selected or no stereopilot signal is detected.

- AST On when AST band selected.

- AF On when AF follow mode is enabled (see also Tuning). Flashes if no RDS datareceived.

- TA On in TA mode and flashing during a traffic announcement in progress.

- TP On when a traffic station is received, flashing when the station is not a traffic stationand TA mode is on.

- PTY On when PTY code received, flashing during PTY search.- DOLBY On in cassette mode when dolby selected.

- ME/CR On in cassette mode when ME/CR selected.

Non Volatile MemoryEither 256 or 512 bytes. The amount of memory determines the maximum number of alternativefrequencies to be stored per preset (5/9 AFs for 256/512 bytes EEPROM).

The following information is stored in NVM:

- Checksum to verify whether an EEPROM has been initialized or not. If a not initialized EEPROM

has been detected default values will be stored to insure reasonable settings for e.g. the audiocontrol values.

- System status e.g.: band, audio source (radio / cassette / external).

- User programmable options.

- For each band (FM1, FM2, FM-AST, MW1, MW-AST, LW): six preset frequencies and one non-preset frequency, last used preset.

- For each stored FM frequency:

- PI-code

- PS Name (512 byte EEPROM only)

- AF List (9 AFs maximum, 5 AFs for 256 byte EEPROM)

- AF follow mode on/off.

- Audio controls: volume, bass, treble, fader, balance and loudness.

- Four digit security code (0000 - 9999).

- Security code can be preprogrammed with the keyboard by means of a service mode, or apreprogrammed EEPROM has to be used.

- Security code can not be changed by the user. The security code can be enabled or disabledby the user; enable/disable status is stored in NVM.

- If enabled, the security code must be entered each time the main supply line has beeninterrupted or the radio has been removed from the retrack.

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External audio inputAutomatically switches to external audio source when a connector is inserted.

External/radio mode key.

Optional source switching to cassette mode (cassette is in) or always to radio mode (option diode D6is in) when the external plug is removed.

SoundVolume, balance, fader, treble and bass control with vol-up/down keys.

Analog control select key to cycle through balance, fader, treble and bass.

Mute key

Automatic muting during tuning and AST search (silent tuning).

Break-in of traffic announcements (in TA mode) and PTY-alarm messages when the radio is muted orin cassette / external mode. The volume level during a TA / PTY message can be installed to one of 5fixed by means of the user programmable options.

Loudness switching.

Sound settings are stored at switch-off and recalled at switch-on.

"Bleep" tone to confirm user actions such as storing a programme preset, entering AST mode, etc.

Mono / stereo function.

Output pins for mute, loudness and traffic announcement, for use with conventional audio controlcircuitry.

Power-amplifierConventional power-amplifiers can be used such as two TDA1552Q (4 x 22 Watt), one TDA1554Q (4x 11 Watt (2 load) or 6 Watt (4 load)) or one TDA1552Q (2 x 22 Watt (4 load)) in a BTL stereoconfiguration.

OptionsDiode programmable

- Detachable front

- No LW band

- FM only- No security code

- Static on/off switch

- Method of source switching

- Application area of the radio (USA/Europe)

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User programmable- 2 / 4 Loudspeakers

- Loudness on/off

- Bar / digital sound control display

- TA / PTY Alarm volume level

- Security code enable/disable

Automatically detected

- Digital sound control chip or conventional controls

- 120 / 144 segment LCD display

- 256 or 512 bytes EEPROM

- Loudness- Local/DX FM Tuner Control

- AMS )

- Dolby ) Cassette deck functions

- ME/CR )

Remote control unit.

Power connectionsContinuous power supply input. Normally connected directly to the car battery. All supply power is

drawn from this input.Ignition key input.Normally connected to the accessorycontact of the ignition switch. Used forswitchingthe radio on/off by the ignition key. This input is also used when the static on/off switch option is choseninstead of the momentary on/off key. In this case the static on/off switch button is connected to theignition key input.

Switching-on/offRecall of last system status (e.g.: frequency, band, sound control settings, RDSstatus and last selectedaudio source).

Switch on by:

- Power key, can be static or momentary.- Ignition contact (after the set was switched off by turning the ignition off).

Switch off by:

- Power key, can be static or momentary.

- Ignition contact.

- Removal of detachable keyboard.

- Opening of the security contact.

- Wrong security code entered (after 30 to 40 seconds).

- When switched on while the ignition contact is (and remains) off, the set will automatically switch offafter 60 minutes.

- The radio will switch on again when switched off due to a power dip during engine start.

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CassetteAutomatically switches to cassette mode after insertion of a cassette

Interfaces with a mechanically controlled cassette deck

Play/wind mode detection

Play direction detection for auto-reverse cassette decks

Radio reception during wind mode

Cassette/Radio mode key

Metal/Chromium tape on/off key

DOLBY system on/off key

AMS (Auto Music Search) on/off key

Optional source switching to external mode (cd plug is in) or always to radio mode (option diode D6 isin) when the cassette is ejected.

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4 TARGET CHARACTERISTICS OF THE RADIO

General

Supply voltage range 10.2 to 16 V

Quiescent current, power off 2 mA (typ.)

power on 520 mA (typ.)

Operating ambient temperature -30 to 75 C

FM frequency range Europe 87.5 to 108 MHz

USA 87.9 to 107.9 MHz

AM frequency range Europe 144 to 288 kHz (LW)

531 to 1629 kHz (MW)USA 530 to 1710 kHz (MW)

IF-frequency (AM and FM) 10.7 MHz

FM characteristics

55

12 04.3

5 0

Signal generator

Radio aerial

input (150 Ohm)

Vin

Figure 3 Dummy aerial to test the FM mode

Vsupply= 14.4 V,

Tamb= 25C,

fo= 98 MHz,

fdev= 22.5 kHz,fmod= 1 kHz unless otherwise specified.

Dummy aerial as shown in Figure 3.

Aerial input voltage (Vin), for -3 dB limiting (fmod= 400Hz) 10 V

for (S+N)/N = 26 dB 3 V

for 10 dB crosstalk (stereo) 150 V

Signal-to-noise ratio over most of the signal range 60 dB

RF signal handling capability for THD < 2% at 75kHz dev. > 2 V

AF output over most of the signal range

measured at pin 11 of IF module TEA6100. 150 mV

AM suppression over most of the signal range > 50 dB

Total Harmonic Distortion over most of the signal range. 75 kHz dev. 0.5 % (typ.)

Adjacent signal selectivity (two signal method) S200 > 44 dB

IF bandwidth 3dB bandwidth 160 kHz

IF suppression > 85 dB

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Search sensitivity Vin > 20 VRDS sensitivity: Traffic Announcement Vin > 14 V

PService Name Vin > 16 V

IF counter resolution 6.4 kHz

Frequency grid Search Tuning 100 kHz

Manual Tuning 50 kHz

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AM characteristics

50

60

50

Signal generator

Vin

Radio aerial input

65 pF

15 pF

Figure 4 Dummy aerial to test the AM mode

Vsupply= 14.4 V,

Tamb= 25C,

fo= 999 kHz,

m = 0.3,

fmod= 1 kHz unless otherwise specified.

Dummy aerial as shown in Figure 4.

Aerial input voltage (Vin),

for (S+N)/N = 26 dB MW 45 V

LW 70 V

Signal-to-noise ratio for Vin = 1 mV > 45 dB

AGC range Vin/500 mW for 10 dB variation of AF output 90 dB

RF signal handling capability for THD < 10 % at m = 0.8 1.4 V

Total Harmonic Distortion over most of the

AGC range, m = 0.8, fmod = 400 Hz < 2 %

Total bandwidth B 3dB 5 kHz

Fidelity ( -3 dB ) 30 Hz - 2 kHz

IF suppression tuned frequency 1400 kHz, Vin = 20 V 62 dB

Image rejection tuned frequency 1400 kHz, Vin = 20 V 76 dB

IF selectivity S9 36 dB

S20 66 dB

IF counter resolution 500 Hz

Frequency grid,

LW (search and manual tuning) 1 kHz

MW (search tuning) Europe 9 kHz

MW (manual tuning) 1 kHz

MW (search tuning) USA 10 kHz

MW (manual tuning) 1 kHz

Search sensitivity Vin > 40 V

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5 MICROCONTROLLER AND PIN ASSIGNMENTSCCR520S is based on a P83CE528 microcontroller. It is single-chip microcontroller, manufactured in anadvanced CMOS process and is a derivative of the 80C51 microcontroller family.

The pin assignments for CCR520S are given in Figure 5 and Figure 7.

Figure 6 and Figure 8 show the keyboard configurations for the fixed and detachable front respectively.

1

2

3

4

5

6

7

8

9

10

11

12

14

13

15

1617181920

2122

23

25

24

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

P1.5

P1.6

RST

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

XTAL2

XTAL1

P2.0

P2.1

P2.2

P2.3

P2.4P2.5

P2.6

P2.7

PSEN

AL E

E A

P0.7

P0.6

P0.5

P0.4P0

.3

P0

.2

P0

.1

P0

.0

Vd

d

P1

.0

P1

.1

P1

.2

P1

.3

P1

.4

EXSTAT

SCL

SDA P1.7

RESET

CMECR

PILOT

SECUR

BLPTST

CDOLBY KEYB5

PSEN

AL E

E A

ON

TA

CMUTE

RMUTE

Vdd

CDIR

CINDRV

IGN

CPLYWD

LO/DX

LOUDN

AUMUTE

CENABL

XTAL2

XTAL1

EXMUTE

KEYB0

KEYB1

KEYB2

KEYB3

KEYB4

Vss

Vss

KEYB6

RDSDAT

RDSCLK

CCR520S

(P83CE528)Vs s

P3.0

Vss

Vss

Vss

Vs sVss

Vdd

Vdd

HOLD

OPTROW

Figure 5 Pinning of CCR520S for fixed front

P1

P3P4 /

AMS

P2 P6 /

DOLBY

P5 /

MECR

AUTO/

MAN

LOCAL/

DX

MODEVOL

DOWN

FREQ

DOWNPRE DOWN/

DOLBY

VOL UPFREQ. UPSTEREOPRE UP/

MECR

SEL. DISP.

POWERSELECTMUTEBANDASTTAPTY

CCR520S

P2.1 KEYB1

P2.2 KEYB2

P2.3 KEYB3

P2.4 KEYB4

P2.5 KEYB5

P2.6 KEYB6

P2.0 KEYB018

19

20

21

23

22

24

LOUD/RESET

AF/

REG

SCAN

Figure 6 Keyboard configuration for fixed front

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1

2

3

4

5

6

7

8

9

10

11

12

14

13

1516171819202122

23

25

24

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

P1.5

P1.6

RST

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

XTAL2

XTAL1

P2.0

P2.1

P2.2

P2.3

P2.4P2.5

P2.6

P2.7

PSEN

AL E

E A

P0.7

P0.6

P0.5

P0.4P0.3

P0.2

P0.1

P0.0

Vdd

P1.0

P1.1

P1.2

P1.3

P1.4

EXSTAT

SCL

SDA P1. 7

RESET

CMECR

PILOT

SECUR

BLPTST

CDOLBY SDA_FRONT

PSEN

AL E

EA

ON

TA

CMUTE

RMUTE

Vdd

CDIR

CINDRV

IGN

CPLYWD

LO/DX

LOUDN

AUMUTE

CENABL

XTAL2

XTAL1

EXMUTE

KEYB0

AMS

Vss

Vss

SCL_FRONT

RDSDAT

RDSCLK

CCR520S

(P83CE528)Vs s

P3.0

Vss

Vss

Vss

Vs sVss

Vdd

Vdd

KEYB1

KEYB2

KEYB4

HOLD

OPTROW

Figure 7 Pinning of CCR520S for detachable front

CCR520S

23

24

1415

SD A

SC L

4

5

6

7

11

DETACHABLE

KEYBOARD

SCANNER

PCF8574

9

10

P1

P 3P4 /

AMS

P2 P6/

DOLBY

P5/

MECR

AUTO/

MA N

LOCAL/

DX

MODEVO L

DO W N

F RE Q

DO W N

PRE DOWN/

DO L B Y

VO L

UP

F RE Q

U P

STEREO

SELECTM U T EBANDAS TT APT Y

LOUD/RESET

AF /

RE G

SCAN

P2.0 KEYB0

P2.1 KEYB1

P2.2 KEYB2

P2.4 KEYB4

AF LOCAL/

DX

POWER

FREQ.

UP

TA /

RE G

PTY

FREQ.

DOWN

LOUD/

RESET

SCAN

18

19

20

22

P2.6 SCL_FRONT

P2.5 SDA_FRONTRC5 to IIC

Convertor

DAV(L)

SC L

SD A

VS2 +5V

GND

SE L

DISP

PRE UP/

MECR

SEL DISP

Figure 8 Keyboard configuration for detachable front

When the detachable keyboard option is chosen it is not necessary to use all the keys in the small fixedkeyboard. At least the power key should be mounted when is chosen for the momentary on/off key. (Staticon/off switch option disabled)

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The following table gives a short description of all pins.

PIN NAME I/O DESCRIPTION

1 EXSTAT I Status of external audio jack

2 SCL I/O I2C Bus Clock line

3 SDA I/O I2C Bus Data line

4 RESET I Device reset

5 CMECR I Cassette ME/CR select

6+16+28+39 Vss GROUND

7 PILOT I/O Stereo indication / mono/stereo control

8 RDSCLK I RDS Clock from RDS demodulator

9 SECUR I Security contact

10 BLPTST I/O Bleep output / Test input (service mode)

11 CDOLBY I/O Cassette Dolby select

12 RDSDAT I RDS Data from RDS demodulator

13 EXMUTE O Mute external audio source

14 XTAL2 O Oscillator output

15 XTAL1 I Oscillator input

17+38 Vdd +5 V supply voltage

18 KEYB0 I/O Keyboard matrix line 0



21 KEYB3 I/O Keyboard matrix line 3 / AMS select

22 KEYB4 I/O Keyboard matric line 4

23 KEYB5 I/O Keyboard matric line 5 / detach. I2C Data

24 KEYB6 I/O Keyboard matric line 6 / detach. I2C Clock

25 HOLD I Power supply OK in

26 /PSEN O Program Store Enable (n.c.)

27 ALE O Address Latch Enable (n.c.) (disabled)

29 /EA I External Access (connect pull-up)

30 ON O Power supply on control

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PIN NAME I/O DESCRIPTION

31 TA O Traffic announcement in progress

32 CMUTE O Cassette mute

33 RMUTE O Radio mute

34 CDIR I Cassette direction (forward/reverse)

35 CINDRV I Cassette in drive

36 IGN I Ignition contact status or static on/off switch

37 CPLYWD I Cassette play/wind mode40 OPTROW O Option row output

41 LO/DX I/O Local / DX control

42 LOUDN I/O Loudness

43 AUMUTE O General audio mute

44 CENABL O Cassette enable

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6 KEYBOARDThe keyboard consists of a 7-line triangular matrix connected to the microcontroller or the I/O expanderPCF8574. The following table lists the available keys with their functionality in radio/CD/external mode.

NAME DESCRIPTION

P 1 Preset-1

P 2 Preset-2

P 3 Preset-3

P 4 / AMS Preset-4 / Auto Music Search on/off (cassette)

P 5 / ME/CR Preset-5 / Metal/Chromium on/off (cassette)

P 6 / DOLBY Preset-6 / Dolby on/off (cassette)

POWER Power on/off (momentary on/off key)

VOL-UP Analog sound setting up

VOL-DOWN Analog sound setting down

SELECT Select analog function for update

MUTE Mute on/off

FREQ-UP Manual / search tuning upward

FREQ-DOWN Manual / search tuning downward

AUTO/MANUAL Switch between manual / search tuning

BAND Cycle through bands

AST Automatic search tuning band select and programming

AF / REG RDS AF follow mode on/off / regional mode on/off

TA RDS traffic information mode on/off

PTY RDS display current PTY / enter PTY search mode

LOUD / RESET Loudness on/off / Sound settings reset

MODE Radio / Cassette / external selection (long pressed, display clock)

LOCAL / DX Local / DX selection

STEREO Suppress/enable stereo mode

PRE-UP / ME/CR Programme preset up / Metal/Chromium on/off (cassette)

PRE-DOWN /DOLBY Programme preset down / Dolby on/off (cassette)

DISPLAY Select display (Clock display / PTY / frequency / PS name)

SCAN Automatic frequency scan

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The keys used on the infra red remote control are presented in the following table. The RC5 device codeused is 11D.

NAME DESCRIPTION

To be defined To be defined




To be defined To be definedTo be defined To be defined








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7 OPTION DIODES

1

2

3

4

5

6

7

8

9

1 01 1

12

14

13

15

16

17

18

19

20

21

22

2 3

2 5

2 4

2 6

2 7

2 8

2 9

3 0

3 1

3 2

3 3

34

35

36

37

38

39

40

41

42

43

44

P1.5

P1.6

RS T

P3.1

P3.2

P3.3

P3.4

P3.5

P3.6

P3.7

XTAL2

XTAL1

P2.0

P2.1

P2.2

P2.3

P2.4P2.5

P2.6

P2.7

PSEN

AL E

EA

P0.7

P0.6

P0.5

P0.4P0.3

P0.2

P0.1

P0.0

Vdd

P1.0

P1.1

P1.2

P1.3

P1.4

P1.7

Vss

CCR520S(P83CE528)

P3.0

Vs s

Vss

Vs s

Vdd

D3 D 4 D 7

CENABLE

RMUT E

CMUT E

EXMUTE

D5

T A

D1

BLPT ST

D 6

D2

KEYB1

Figure 9 Location of option diodes

Diode Description

D1 Detachable front

D2 FM Only

D3 No LW band

D4 No security

D5 Static on/off switch

D6 Method of source switching

D7 USA application

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8 LDC DISPLAY

The Liquid Crystal Display (LCD) is driven by either one PCF8576 or two PCF8566s. Figure 10 shows allthe segments of the display. To support the RDS programme service name (PS) feature, the display isequipped with 8 alpha numeric characters. With 13 segments per character, display is possible of allrequired RDS characters (capitals only); with 16 segments per character, umlauts and the accent can bedisplayed as well.

Both displays operate in 1:3 multiplex mode.

Decimal Point

7 Segment Display

8 Single Segments

1

7

8

Total segments

A

B

C

D

E

F

G

HI

J

K

LM

A

B

C

D

E

F

G

1 2 3 4 5 6 7 8 9

N PO

8 Characters 104

120

STEREO AST AF TA PTYME/CRTP

Umlaut display only

1

7

8

128

144

Standard Umlaut

Digit

Figure 10 Liquid Crystal Display (LCD) layout

car radio system ccr520s

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